3. The first Google doodle was a Burning Man symbol. Founders Larry Page and Sergey Brin went to the Burning Man festival in 1998 and added the doodle to let users know they were away from the office that weekend.

7. Around 1,000 of Google's employees became millionaires when the company went public in 2004.

8. One of those millionaires was masseuse Bonnie Brown, who worked at the company giving back rubs for $450 a week back in 1999.

9. The "I'm Feeling Lucky" button, which bypasses the results page to take users directly to the first result of their search, has been estimated to cost Google around $100m in lost ad revenue every year.